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Relativistic spin-momentum locking in ferromagnets.
Xujia Gong1, Amar Fakhredine2, Carmine Autieri1,3
1International Research Centre Magtop, Institute of Physics, Polish Academy of Sciences, Aleja Lotników 32/46, PL-02668, Warsaw, Poland. xgong@magtop.ifpan.edu.pl.
This study reveals relativistic spin-momentum locking in ferromagnets, unlike previous findings in time-reversal-breaking materials. Ferromagnetic materials offer a promising platform for observing this phenomenon and its associated emergent phenomena.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Spintronics
Background:
- Relativistic spin-momentum locking is known in time-reversal-breaking materials like altermagnets.
- Its behavior in ferromagnetic materials, especially in the relativistic regime, remains unexplored.
Purpose of the Study:
- Investigate relativistic spin-momentum locking in various ferromagnets.
- Characterize its properties and presence in different ferromagnetic systems.
Main Methods:
- Density functional theory (DFT) calculations.
- Prototypical ferromagnets studied: SrRuO3, CrTe, CrAs, MnPtSb, and Ni.
Main Results:
- Relativistic spin-momentum locking was confirmed in all studied ferromagnets.
- SrRuO3 exhibits locking even when canted moments are forbidden.
- Centrosymmetric ferromagnets show altermagnet-like locking, while noncentrosymmetric MnPtSb shows interplay with relativistic p-wave.
- FCC Ni displays a complex combination of two locking patterns.
Conclusions:
- Ferromagnets are promising platforms for observing relativistic spin-momentum locking due to larger bandwidths.
- This phenomenon is crucial for understanding spin Hall currents, photocurrents, and the Rashba-Edelstein effect.
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